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well here's the reason the judge didn't allow it to be used.
(CNN) -- Two days before George Zimmerman goes on trial, voice recognition experts testified it is not possible to positively identify whose screams are heard in the background of the 911 calls made the night Trayvon Martin was shot.
Florida Judge Debra Nelson will continue the hearing on the admissibility of the experts' testimony at a later date. Jury selection begins Monday.
A third audio expert was unable to testify Saturday because he was stuck on a plane.
The defense argues the state's audio experts are using unproven science to determine who is heard screaming and they shouldn't be allowed to testify. Nelson wanted to hear about the technology used for voice analysis.
Trayvon Martin shooting Fast Facts
Forensic audio expert Dr. Peter French, who testified via teleconference from the United Kingdom, described research involving the recording of stressed cries versus normal voice samples.
In the case of the 911 calls, French said that the poor quality of the recorded voices means that none of the processes available can provide any useful information about the identity of the screaming person.
"I've never come across a case in the 30 years of my career where anybody has attempted to compare screaming with normal voices," French said.
French also said in this case the recording "isn't even remotely suitable for speaker comparison."
George Doddington, an electrical engineer who works as an adviser with the National Security Agency, testified Saturday that his conclusion about the 911 call was similar to Dr. French's: that due to the quality of the data, it is not going to provide any viable source for making an identity decision.
Doddington said evaluating one second of speech to reach a conclusion is "ridiculous."
"The less you have, the worse the performance," he said.
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